This is an excellent Patek Philippe vintage Calatrava 3588/1 
This model is also known as Clous De Paris
 
Made in Switzerland
Circa 1975
18k white gold with a Patek Philippe Milanese bracelet.
Very beautiful collectors piece.
Iconic and very elegant gentlemen's Patek Philippe
Fine automatic caliber 28-255 with solid gold 22k rotor
36 Jewels
The beautiful solid gold bracelet and watch will fit 18.5 - 19cm wrist
35mm excluding crown
Sapphire crystal
Original Cobalt Blue Patek Philippe Dial Made of solid 18k Gold
SIGNED PATEK PHILIPPE, GENEVE, REF. 3588/1, MOVEMENT NO. 1287242 , CASE NO. 22742356
This watch functions precisely
It is original and will become a perfect collectible treasure